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1.
异步多传感器偏差估计问题是数据融合系统中的常见问题.在已有算法中,由于忽略了伪量测方程中的加速度项,在高度机动目标条件下的偏差估计可能是有偏的,为此提出了一种针对高度机动目标的异步多传感器偏差估计算法.该算法在构造伪量测差分矢量时通过反求最适的伪量测同步时刻,可以建立无加速度项的伪量测方程,并通过Kalman滤波对系统...  相似文献   

2.
基于UKF 的变采样率多异质传感器异步数据融合   总被引:1,自引:0,他引:1  
针对异质传感器数据融合能够实现信息互补,改善目标跟踪精度,提出了一种多异质传感器在变采样率下的异步量测融合算法,即首先将多传感器数据组合成类似于单传感器数据的异步数据处理方法,进行点迹合成,再将合成后的虚拟量测对当前时刻的目标状态进行更新.变采样率跟踪是基于网络或栅格多传感器异步融合跟踪的基础,通过引入时戳的概念给出了基于UKF(Unscented Kalman Filter)的具体融合算法,最后通过仿真验证了该算法的有效性。  相似文献   

3.
一种基于多传感器轨迹融合的伪实时场景监控系统   总被引:1,自引:0,他引:1  
在分布式多传感器融合系统中,各局部传感器接收到量测信息后,经关联得到局部轨迹,再将该轨迹送入融合中心进行处理.本文对一种伪实时场景监控系统,实现轨迹关联后,提出根据固定场景量测误差的先验知识,计算轨迹修正函数,以获得更好的轨迹融合结果.实验结果表明,该算法能够实现伪实时的轨迹关联与融合,充分考虑了场景所造成的量测误差,融合效果优于加权融合算法.  相似文献   

4.
多传感器异步采样系统的顺序融合   总被引:2,自引:0,他引:2  
针对现有基于伪量测的异步融合算法存在实时性差、融合时刻计算负荷大以及人为引入噪声相关等问 题,提出了一种新的基于采样点顺序离散化思想的顺序式异步融合算法.该算法首先将各个传感器的测量值在融合 中心的坐标系中和时钟下进行映射统一;然后,选取融合周期内各采样时刻对连续状态系统进行顺序离散化,从而 获得本周期内各采样点间的状态方程和相应的测量方程.最终,使用线性最小均方误差意义下最优的线性卡尔曼滤 波器实现本周期内异步采样量测的顺序滤波融合.仿真分析表明,该算法和基于伪量测的异步融合算法相比具有较 少的计算量、较好的实时性和较高的估计融合精度.  相似文献   

5.
针对量测不确定条件下多传感器量测数据的合理利用和有效融合问题,提出了一种量测不确定下多传感器量测自适应数据融合算法。算法实现中考虑到传感器量测受扰动影响的具体情况,通过单个传感器的量测似然度的求解确认等效量测,并利用传感器量测数据间统计距离的构建完成对等效量测优化,进而实现不含扰动影响传感器量测数据的合理选择和融合。理论分析和仿真实验验证结果表明:新算法不仅有效改善扰动对于滤波精度的不利影响,并且相对于分布式融合方式降低计算复杂度。  相似文献   

6.
基于模糊推理的多传感器数据融合方法   总被引:7,自引:0,他引:7  
针对多传感器目标跟踪系统可能出现的传感器漏检现象,提出了一种基于模糊推理的消除漏检现象影响的方法。该算法根据各传感器的量测变化,及时调整参与融合的各传感器量测的数目及其加权系数,保证量测融合值的有效性。通过对两个传感器进行数据融合和目标跟踪的仿真表明,该算法是一种简单有效,有工程应用前景的数据处理算法。该方法同样适用于多于两个传感器的多传感器融合系统。  相似文献   

7.
张俊根 《控制工程》2023,(4):739-745
针对纯方位跟踪(BOT)的非线性滤波和距离可观测性较差问题,提出了一种新的分布式多传感器辅助变量伪线性卡尔曼滤波器(DM-IVPLKF)。该滤波器利用辅助变量伪线性卡尔曼滤波器(IVPLKF)独立处理目标测量值,通过偏差补偿伪线性卡尔曼滤波器(偏差补偿PLKF)解决由于量测向量与伪线性噪声相关而产生的偏差,将递归辅助变量估计方法嵌入偏差补偿PLKF中,对目标状态估计和协方差进行修正。所提算法利用多传感器最优信息融合准则,对目标状态进行融合估计。然后,推导了多传感器BOT的克拉默-拉奥下界(CRLB)。通过仿真实验,将所提算法与传统算法进行对比,仿真结果证明了所提算法具有较高的跟踪精度。  相似文献   

8.
李松  胡振涛  李晶  杨昭  金勇 《计算机科学》2013,40(8):277-281
针对传感器探测概率小于1的不完全量测情况下的非机动目标跟踪问题,提出一种基于多传感器不完全量测下的扩展Kalman滤波算法。首先,利用残差检测的野值剔除方法,确定目标状态估计过程中传感器是否接收到正确的量测数据;其次,基于每个传感器的量测数据,在不完全量测下采用改进的扩展卡尔曼滤波算法分别对目标运动状态进行估计;进而结合多传感器最优加权融合方法求解基于多传感器观测数据的状态估计;最后,将算法应用到光电跟踪系统中。仿真实验得到不完全量测下传感器探测概率对滤波效果的影响,验证了算法的有效性,其跟踪精度接近完全量测下的状态估计精度。  相似文献   

9.
在构建传感器模糊量测认知偏差的基础上,提出一种新的多传感器融合估计方法。运用相邻量测样本均值和协方差度量传感器可靠性,确保融合权重分配的客观性和灵敏性。实验结果表明,与基于均值融合算法和支持度融合算法相比,使用该方法得到的融合权值分配方式更加合理,可进一步提高估计精度。  相似文献   

10.
采用序贯滤波的红外/ 雷达机动目标跟踪   总被引:3,自引:0,他引:3       下载免费PDF全文
当机动目标状态是非平稳和非线性时,红外传感器和雷达的目标状态方程和量测方程都是非线性和非高斯的,为了解决经典跟踪算法的残差较大或发散的问题,提出一种新的融合跟踪算法:在对红外传感器和雷达的量测数据进行时间对准和同步融合后,将融合后的量测数据送入重抽样粒子滤波器进行处理以预测和跟踪机动目标.最后给出了一个仿真跟踪实例,并与同类多雷达跟踪的效果进行了比较,说明了异类融合跟踪优于同类多雷达融合跟踪.  相似文献   

11.
For multisensor systems with unknown parameters and noise variances, three self-tuning measurement fusion Kalman predictors based on the information matrix equation are presented by substituting the online estimators of unknown parameters and noise variances into the optimal measurement fusion steady-state Kalman predictors. By the dynamic variance error system analysis method, the convergence of the self-tuning information matrix equation is proved. Further, it is proved by the dynamic error system analysis method that the proposed self-tuning measurement fusion Kalman predictors converge to the optimal measurement fusion steady-state Kalman predictors in a realisation, so they have asymptotical global optimality. Compared with the centralised measurement fusion Kalman predictors based on the Riccati equation, they can significantly reduce the computational burden. A simulation example applied to signal processing shows their effectiveness.  相似文献   

12.
自校正多传感器观测融合Kalman估值器及其收敛性分析   总被引:2,自引:1,他引:1  
对于带未知噪声方差的多传感器系统,应用加权最小二乘(WLS)法得到了一个加权融合观测方程,且它与状态方程构成一个等价的观测融合系统.应用现代时间序列分析方法,基于观测融合系统的滑动平均(MA)新息模型参数的在线辨识,可在线估计未知噪声方差,进而提出了一种加权观测融合自校正Kalman估值器,可统一处理自校正融合滤波、预报和平滑问题,并用动态误差系统分析方法证明了它的收敛性,即若MA新息模型参数估计是一致的,则它按实现或按概率1收敛到全局最优加权观测融合Kalman估值器,因而具有渐近全局最优性.一个带3传感器跟踪系统的仿真例子说明了其有效性.  相似文献   

13.
This paper addresses the design of robust weighted fusion Kalman estimators for a class of uncertain multisensor systems with linearly correlated white noises. The uncertainties of the systems include the same multiplicative noises perturbations both on the systems state and measurement output and the uncertain noise variances. The measurement noises and process noise are linearly correlated. By introducing two fictitious noises, the system under consideration is converted into one with only uncertain noise variances. According to the minimax robust estimation principle, based on the worst‐case systems with the conservative upper bounds of the noise variances, the four robust weighted fusion time‐varying Kalman estimators are presented in a unified framework, which include three robust weighted state fusion estimators with matrix weights, diagonal matrix weights, scalar weights, and a modified robust covariance intersection fusion estimator. The robustness of the designed fusion estimators is proved by using the Lyapunov equation approach such that their actual estimation error variances are guaranteed to have the corresponding minimal upper bounds for all admissible uncertainties. The accuracy relations among the robust local and fused time‐varying Kalman estimators are proved. The corresponding robust local and fused steady‐state Kalman estimators are also presented, a simulation example with application to signal processing to show the effectiveness and correctness of the proposed results. Copyright © 2016 John Wiley & Sons, Ltd.  相似文献   

14.

对于带不确定模型参数和噪声方差的线性离散时不变多传感器系统, 用虚拟噪声补偿不确定参数, 系统转化为仅带噪声方差不确定性的多传感器系统. 用加权最小二乘法和极大极小鲁棒估计准则, 基于带噪声方差保守上界的最坏情形保守系统, 提出一种鲁棒加权观测融合稳态Kalman 预报器, 并应用Lyapunov 方程方法证明了它的鲁棒性, 同时给出了与鲁棒局部和集中式融合Kalman 预报器的精度比较. 最后通过一个仿真例子说明了如何搜索参数扰动的鲁棒域, 并验证了所提出的理论结果的正确性和有效性.

  相似文献   

15.
White noise deconvolution or input white noise estimation has a wide range of applications including oil seismic exploration, communication, signal processing, and state estimation. For the multisensor linear discrete time-invariant stochastic systems with correlated measurement noises, and with unknown ARMA model parameters and noise statistics, the on-line AR model parameter estimator based on the Recursive Instrumental Variable (RIV) algorithm, the on-line MA model parameter estimator based on Gevers–Wouters algorithm and the on-line noise statistic estimator by using the correlation method are presented. Using the Kalman filtering method, a self-tuning weighted measurement fusion white noise deconvolution estimator is presented based on the self-tuning Riccati equation. It is proved that the self-tuning fusion white noise deconvolution estimator converges to the optimal fusion steady-state white noise deconvolution estimator in a realization by using the dynamic error system analysis (DESA) method, so that it has the asymptotic global optimality. The simulation example for a 3-sensor system with the Bernoulli–Gaussian input white noise shows its effectiveness.  相似文献   

16.
The Belavkin filter for the H-P Schrödinger equation is derived when the measurement process consists of a mixture of quantum Brownian motions and conservation/Poisson process. Higher-order powers of the measurement noise differentials appear in the Belavkin dynamics. For simulation, we use a second-order truncation. Control of the Belavkin filtered state by infinitesimal unitary operators is achieved in order to reduce the noise effects in the Belavkin filter equation. This is carried out along the lines of Luc Bouten. Various optimization criteria for control are described like state tracking and Lindblad noise removal.  相似文献   

17.
In this paper, the problem of distributed weighted robust Kalman filter fusion is studied for a class of uncertain systems with autocorrelated and cross-correlated noises. The system under consideration is subject to stochastic uncertainties or multiplicative noises. The process noise is assumed to be one-step autocorrelated. For each subsystem, the measurement noise is one-step autocorrelated, and the process noise and the measurement noise are two-step cross-correlated. An optimal robust Kalman-type recursive filter is first designed for each subsystem. Then, based on the newly obtained optimal robust Kalman-type recursive filter, a distributed weighted robust Kalman filter fusion algorithm is derived for uncertain systems with multiple sensors. The distributed fusion algorithm involves a recursive computation of the filtering error cross-covariance matrix between any two subsystems. Compared with the centralized Kalman filter, the distributed weighted robust Kalman filter developed in this paper has stronger fault-tolerance ability. Simulation results are provided to demonstrate the effectiveness of the proposed approaches.  相似文献   

18.
This paper addresses the problem of designing robust fusion time‐varying Kalman estimators for a class of multisensor networked systems with mixed uncertainties including multiplicative noises, missing measurements, packet dropouts, and uncertain‐variance linearly correlated measurement and process white noises. By the augmented approach, the original system is converted into a stochastic parameter system with uncertain noise variances. Furthermore, applying the fictitious noise approach, the original system is converted into one with constant parameters and uncertain noise variances. According to the minimax robust estimation principle, based on the worst‐case system with the conservative upper bounds of the noise variances, the five robust fusion time‐varying Kalman estimators (predictor, filter, and smoother) are presented by using a unified design approach that the robust filter and smoother are designed based on the robust Kalman predictor, which include three robust weighted state fusion estimators with matrix weights, diagonal matrix weights, and scalar weights, a modified robust covariance intersection fusion estimator, and robust centralized fusion estimator. Their robustness is proved by using a combination method, which consists of Lyapunov equation approach, augmented noise approach, and decomposition approach of nonnegative definite matrix, such that their actual estimation error variances are guaranteed to have the corresponding minimal upper bounds for all admissible uncertainties. The accuracy relations among the robust local and fused time‐varying Kalman estimators are proved. A simulation example is shown with application to the continuous stirred tank reactor system to show the effectiveness and correctness of the proposed results.  相似文献   

19.
对车载环境下的定位误差作时间序列分析.得到二阶马尔可夫过程的定位误差模型。将定位误差作为观测噪声.以此建立的观测方程中的观测噪声具有时间相关性。利用观测量相差法,把相邻两次观测量的相关部分消去,建立起观测噪声为白噪声的观测方程,并推导出状态估计的递推方程。避免了高阶矩阵的求逆,有效地减少了计算量,并降低了对内存的需求,提高了车载动态定位系统的实时性和定位精度。仿真结果进一步证明了算法的有效性。  相似文献   

20.
Accurate multi-source fusion is based on the reliability, quantity, and fusion mode of the sources. The problem of selecting the optimal set for participating in the fusion process is nondeterministic-polynomial-time-hard and is neither sub-modular nor super-modular. Furthermore, in the case of the Kalman filter (KF) fusion algorithm, accurate statistical characteristics of noise are difficult to obtain, and this leads to an unsatisfactory fusion result. To settle the referred cases, a distributed and adaptive weighted fusion algorithm based on KF has been proposed in this paper. In this method, on the basis of the pseudo prior probability of the estimated state of each source, the reliability of the sources is evaluated and the optimal set is selected on a certain threshold. Experiments were performed on multi-source pedestrian dead reckoning for verifying the proposed algorithm. The results obtained from these experiments indicate that the optimal set can be selected accurately with minimal computation, and the fusion error is reduced by 16.6% as compared to the corresponding value resulting from the algorithm without improvements. The proposed adaptive source reliability and fusion weight evaluation is effective against the varied-noise multi-source fusion system, and the fusion error caused by inaccurate statistical characteristics of the noise is reduced by the adaptive weight evaluation. The proposed algorithm exhibits good robustness, adaptability, and value on applications.   相似文献   

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